Typewriting machine



W. P. KIDDER TYPEWRITING MACHINE Jan. 6, 1925- 3522MB Original Filed Sept. 18, 1920 4 Sheets-Sheet 1 A TTORNEY jam, w. P. KIDDER TYPEWRITING MACHINE ATTORNEY j, fi, 3925.

W. P. KIDDER TYPEWRITING MACHINE Original Filed p 18, 1920 4 Sheets-Sheet s mmxdiiilii A TTOR/VEY 1,522,193 P. KIDDER 4 Sheec-Sheat g,

TYPEWRITING MACHINE Original Filed Sept. 18, 1920 Jan. 6, 1925.

% a ygrok' 'KUORNEY Patented Jan. 6,

: emrsn armies;

Lea area TER INDUSTRI S. INC., on roan.

nocnnsrnn, new 'YORK, A oonroniamon or NEW r'rrnwnrrme MACHINE.

Application filed September 18, 1920,,Seria1 No. 411,146. Renewed January 18, 1924-.

To all whom it may concern:

'Be it known that I, WELLINGTON PARKER Kinnnn, a citizen of the United States, and a resident of Greenwich, in the county of Fairfield and State of Connecticr, have invented certain new and useful- Improvements in Typewriting Machines, of which the following is al'specification.

This invention relates to atypewriting machine. Its, objects and advantages are simplicity of construction; easeof action;

lightness of weight; efficiency of impression; silence in operation; the demountability of type bars whereby type bars having one style of printing characters of a given language may be substituted for type bars'having other styles of printing characters pertaining to that language; and

whereby, if desired,.typebarshaving the.

printing characters of one language may be substituted for type bars having the printing characters .of another language; and a single platen and paper carriage shifting mechanism. Nevertheless the described mechanism for operating the type bars which severally carrya plurality of printing characters is also useful in double .shift platen and paper carriage constructions. The paper and platen carriage actuating mechanisms may be useful, even though the type bars carry' only one printing character;

each and-may be also useful with other constructions of type bar actuating mechanisms. It is also noted that a typewriting machine embodying the present invention comprises an endw-ise movable platen and paper carriage which is given a vertical shifting movement to bringv theprinting.

- point of the .platen into one or another of a actors on a. type bar, one above another in the form now. shown; the usual transversely plurality of .positions for receiving theimpression of any one of a plurality of charextending escapement rack-bar fixed to the carriage being also given a carrespondin movement during the vertical shiftsof the carriage, and my new escapement movement invention, only one type bar and its actuatmg means between the type bar.and finger key being shown for greater clearness and the others being removed.

Fig. .2 is a vertical elevational section from front to back of the machine, being in section at a line corresponding to line 22 of Fig. .1, and showing the vendwise movable platen and paper carriage, andparts carried by it and cooperating with it; the single, key-actuated shift mechanism therefor; and my new'carriage shifting mechanism; and one of the numerous identical, key-actuated, type-bar actuating mechanisms. The endwise movable type bar is shown with the printing characters, one above the other and in position of initial rest. The carriage shift key is shown depressed with the carriage in its lowest-shift position. The charactered end of the type-bar is shownwith an upper corner and an under corner guide I for cooperation with type bar guides as in the prior art.

Fig. 3 is a rear elevational view of the machine, and particularly shows, in rear elevation, my new paper and platen carriage escapem'entmechanis F ig.4 is a top plan view, partly-in section at line H of Fig. 2 of my new escapement mechanism.

Fig. 5 is a perspective view of the typebar actuating mechanism detached.

Fig. 6 is an end view of the platen and paper carriage detached.

Fig. 7 is a vertical section atline 77 of Fig. 1, of the parts shown in Fig. 1, but in the position which they have at the time of ype b Fig. 8 is a'perspective view. of members of the carriage shifting mechanism detached.

;In that form of the invention now set forth, a low and approximately rectangular, upstanding main frame comprises a pair' of g1 opposed side framestransversely connected by a front member 1 and by a rear member 1. The rear ends of the side frames terminate each in an upstanding corner arm. 2.

forwardly of which the upper edge of each side frame terminates at a distance forwardly of a corner arm 2, thus f rming in.

the upperedge. of each sidefra. e a depression as at 4 in order to make'room for various operating parts, and to permit endwise travel of the platen and, paper carriage frames 3. The frame also comprises a horicarriage comprising opposed, dependent end a stud 14 projecting from the inner side of a side frame, corner arm 2, rearwardly of the depressions 4:. The bottom edges of the plates 9 are each slotted at 11 to register with the tube slot 11. v

The rocker frame thus formed by the rocker shaft 14, the rocker arms 13, and the carriage guide and lifting rod 12, has its front side member which is the guide and lifting rod 12, operative, at its end portions, in the side frame depressions 4 whereby marked compactness of machine construction is effected; the platen carriage being shiftable up and down above the bottom walls of such depressions 4: to raise or lower past the side frames. The continuous for-- ward edge wall of the arm 2, of the bottom of the depression at and of the upper rear end of the side frame is indicated by 5. Forwardly of such depression and extending to the front edge of a type-bar supporting frame, the upper edgeof each side frame is horizontal, and the type-bar supporting frame bottom webs are secured at (Mo the upper edges of the horizontal portions of the side frames 3.

The opposite side frames support, at their upper edges, a horizontal. transverse typebar supporting frame 7 of triangular shape at its under portion and now assumed to be of light weight metal faced at its rear end portion with a steel plate 7*. The type-bar supporting frame has under horizontal side webs 7 which rest on and are secured at 6 .to the horizontal upper edges of the sidetype-bar supporting frame being provided, on its upper side, with as many type bars as are desired; and being also provided with key actuated, type-bar actuating mechanisms, and also with a platen carriage shift mechanism that is in co-opera- .tive relation with a carriage feed escapement mechanism, the transverse L-shaped rack bar R of which is shown carried by dependent end brackets -R of the carriage, (Figs. 2 and The type-bar actuating key levers 15 are formed severally with an upturned front end provided with a charactered button head and have their rear ends formed with an upwardly and forwardly extending hook 15 pivoted on a transverse pivot rod 16 the zontal, dependent, transverse front bar 7 and is formed with endwise opposed, transverse openings 7 adjacent the rearward edge of its front bar 7. A transverse typebar cover plate 8, having dependent end arms 8 each formed with an out-turned flange 8 and secured to the frame 7 at m, covers all the type bars which stand edgewise and are endwise reoiprocatable between the frame 7 and the cover plate 8; their under and upper edges respectively being in sliding contact with said plates, each of which is provided with opposed guides spaced laterally apart to form an upper guide-way for the upper, and an under guide-way for the under side margin of a type barf All the type bars are mounted radially to the impression point at 7) on the platen roll P which is mounted in a vertically raisable and lowerable, transversely movable platen and paper frame members 3 at the front of said depressions 4. All the hooked ends of the type-bar actuating key levers 15 are retained in their pivoted position on the pivot rod 16 by means of a transverse retaining bar 17 each end of which is fixed at 17 to a side frame.

f Between its ends, each key lever 15 is provided with a laterally projecting cam roll 18 for engagement by the front edge of an upstanding rockable wiper cam 19, one of which is provided for each key lever, and has its under end pivoted on 'a transverse straight pivot rod 20,'the ends of which are carried by the side frames 3, forwardly of the pivot rod 16. The rear edge 21 of each wiper cam 19 is slightly eonvex,and when a key lever 15 is depressed, the cam roll 18 which is forward of the upwardly and rearwardly slanting front edge 22 of the wiper cam, rides downwardly on the front edge 22 and thereby rocks the wiper cam rearwardly bringing its convex edge 21 gradualplates 9 which travel through the frame depressions t during endwise movements of the carriage. The cover plate 8 is provided with dependent pins 8 and the upper surface of frame 7 is provided with grooves 8 to form said opposed guide-ways for each type-bar. In Fig. 1, only one guide-way 8 is shown, dot and dash line's indicating the remainder of the guide-ways 8 and the direction of travel of the type bars.

The platen carriage, end plates 9 have dependent extensions 9 the under ends of which are transversely connected by a there-- to fixed tube 10, the under wall of which has a lengthwise extending slot 11 to permit the carriage to travel endwise in either dily and silently into bearing contact with rection, beyond an end of the transverse. the forwardly extending, straight and horcross-sectionally round, carriage guide and izontal extension 23 of a spiral spring 23*, lifting rod 12, on which the tube 10 is endthe rear end of which is held stationary wise-slida-bly, mounted; the ends of the rod 12 being each fixed to an outward end of a rocker arm 13, and the rearward endsof the rocker arms 13 being each pivoted on are carried by the side frames'3, the front 23 being secured at' 23 to the under the impression point on-the platen; and the end of each horizontal spring extension on a transverse rod 24 the ends of which end of a wiper cam 19 below the pivot rod 20. To an upper portion of each wiper cam 19, the lower end of an upwardly extending link is pivoted at 26, rearwardly of the, pivot rod 20; the upper end of the link being pivoted at 27 to the lower portion of, and between the ends of, an approximately U-shaped lever 28, each end of which is shown forked.

The tension of the spring 23 keeps the front edge 22 of the wiper cam in constant contact with the cam roll '18 on the key lever 15 so that, when in action the key lever is depressed to bring the rear edge of the wiper cam into progressive or gradual rocking contact with the straightened portion 23 of the spring 23. The mechanical co-operation of a key lever with the front edge 22 of a wiper cam 19 is silent, there being nothing in the nature of a hammer blow resulting from this rolling contact.

The concave edge of each lever 28 is forwards. The under end, fork arms of each lever 28 straddle anear 29 dependent from a bracket 30? which is provided, for each lever 28, with a pair of upstanding fork arms 31, the bracket 30 carrying the levers 28 being arranged transversely of the machine and being fixed by clamp screws 32 to the front cross bar 7 of the type-bar supporting frame, the shape of which is shown in Fig. 1, and the slots 7 in which make room for mounting and operating the levers 28 and links 25. v

The upper forward end of each U-shaped lever 28 is provided with a cam roll at28 between its fork arms, the cam roll worl ing in the lengthwise extending concavoconvex cam slot 33, the concave edge of which is forwards and the convex edge of which is rearwards, formed in an upstand- 4 ing cam lever 34, the under end of which is pivoted at 35 between upstanding arms 31 of the bracket 30. The upper front portion of each cam lever 34 is provided with an ear 37 on which the front forked end 38 of a type bar link 39 is pivoted at 40, the rear ward end of this link being also forked and formed onits under side with an open, pinreceiving slot 41 for detachable engagement with the pivotpin 42 through and projecting from bothsides of the front end of the endwise slidable type-bar 43 which is norof printing characters belonging to a given language or by type bars having the printing characters of a different language.

The rear end of each type bar is provided with two printing characters 0 one above the other, the type bar having at its upper rear corner and also at its lower rcar corner a guide projection 3 as heretofore and for cooperation with guides that are located adjacent the, platen, as heretofore and as now indicated by 2.

Depression of a type-bar actuating key lever 15 throws its wiper cam 19 rearwardly and downwardly against the tension of its spring 23, the corresponding link 25 being then moved downwardly and causing the lever 28 to swing rearwardly, and through its cam roll 28 forcing the cam lever 34 to swing rearwards and thereby push its type bar, by means of its link 39, to the impression point.

When the front end of a type-bar actuating key lever 15 is relieved of downward ,pressure, the tension of-the then expanded inner side of aside frame, there is fixed an upwardly extending approximately T- shaped, rocker cam 46 formed with a cam slot 46 'which extends from end to end of the head of the cam above and crosswise of the rocker shaft 45.

The forward end portion 47 of this slot where the cam slot has a forward dwell surface, is, in relation to the shaft 45, lower than the rearward end portion 48 of the slot at which it has a rearward dwell surface.

The rocker cam'46 has, a laterally projecting stud 49 above and rearwardly of the rocker shaft 45, and the rear end of a forwardly projecting link 50 is pivoted thereon, the forward end of the link being pivoted at 51 to the lower end of the rearward arm 52 of the inverted V-shapcd, single, carriage shift lever which is pivotally supported on an inwardly projecting stud 54 of one of the side frames.

The under apical portion of each approximately V-shaped rocker arm 13 connected with the carriage guide, and lifting rod 12, has a laterally projecting stud on its inward face andthis stud carries a cam roll 56 which works in the cam slot 46 of; the cam lever 46.

As shown in Fig. 2, the platen and paper carriage is in its lower position, the, shift key 53 being in depressed position against the tension. of, the shift key return spring 57, shown as a coiled spring the rear end of which is fixed at 58 tothe rear arm 52 of the shiftkey and the front end of-which is fixed at 59 to a side frame 3, forwardly llt) of the rear arm 52. When pressure on the shift key is released, contraction of the spring 57 causes the rockable cam lever 46 to rock downwardly and forwardly, thereby causing the under edge of its cam slot to push forwardly and unwardly against the cam roll 56 and thereby lift said rocker frame comprising the carriage guide and lifting rod 12, and the tube 10 to which the carriage end plates are fixed, to bring the impression point of the platen to the upper printing position. In the higherposition of the carriage, each cam roll 56 is at a dwell in the. higher and rearward portion, v 48 of the cam slots in the opposed rockable cams 46. I

The escapement mechanism comprises, for the upstanding teeth of the lengthwise toothed rack-bar R, a pinion 60 fixed on a revoluble spindle 61 at right angles to the carriage feed path. Spindle 61 is j ournalled in a tubular, spindle holder 60* which is provided with a flange 61 at its rear end. One end of a forwardly projecting leafspring 62 (Fig. 4) is fixed at 63 to the upper side of a horizontally pivoted transverse bracket of which the spindle holder forms a part, the forward end portion of the leaf spring passing under a laterally projecting lug 64 of the spindle holder and the front free end 65 of the spring hearing against the under side of the usual paper guide 66 between which and the platen roll the paper is moved. The spindle 61 has loose on it, (Fig. 3) adjacent the rear side of its flange 61, a toothed star wheel 67 on the rear face of which there is a projecting stud 68 carrying a spring pressed pawl 69 for co-operation with a ratchet wheel 70 of lesser diameter than the toothed wheel 67 and which is fixed on the rear end of the spindle. The spindle holder carrying bracket comprises oppositely pro jecting yoke arms 60", the ends of which .yoke arms are alined. The bracket thus formed is rockably mounted onalined horizontal pivots 71 each carried by an upstanding arm'72of the rear frame member 1.

The radial teeth of the toothed star wheel 67 are indicated by 73. The pawl 69 on the star wheel in engagement with a tooth of the ratchet wheel 70 prevents. rotation fof the star wheel in counterclockwise direction but permits rotation of the star wheel in clockwise direction as' viewed in Fig. 3. The carriage 1s drawn m-one direction, as-

nsual, by a coiled-spring 745, as indicated by the arrow on its 'drum- 75, the pawl and ratchet on the star'wheel then preventing rotation of the starwheel, spindle and rack e'n aging. pinion in the direction of the pa 1 of the spring 74, when the type bar is in sition of initial rest.

* enever a type bar is depressed, a vertically swinging and horizontally movable escapement dog 76 pivoted on a stud 77 projecting rearw'ardly and horizontally from a vertical rocker bracket .78, moves laterally rearwards out of engagement with a tooth of the star wheel; a 'rigidescapement dog 79' directly in front of the movable dog 76 then engaging such tooth and holding .the star wheel from. rotation while the printing impression is being made.

The rigid escapement dog/79 is formed by the free end of a rigid horizontal arm '78 which projects from the upper end of the vertically mounted bracket 78; and in the rearward rocking movement of the rocker bracket 78 the pivoted escapement dog is moved laterally rearwards from under a star wheel tooth. By a follow up motion,

the rigid escapement dog is swung into the the horizontal pivots 71..

place of the pivoted dog under the same star wheel tooth. V Theupstanding rocker bracket 78 has its ends alined and severally pivotfed at 79 in an arm of a vertical U-shaped bracket 80 which is integral with one of the horizontal yoke arms 60 of the spindle holding bracket.

The rocker bracket 78 carries on its rear side a pivoted wiper cam 81 the upper edge of which contacts with the under edge of the pivoted escapement dog 76 and the under edge of which contacts with a horizontal straight portion 82 of a. coiled spring 83, the free end of the straight portion being hooked through a hole in a horn 84 in the wiper cam adjacent but below its pivot, and the free end of its coiled portion being fixed at 83 to the upstanding U- shaped bracket 80 which is oscillatable on The star wheel 67 and the pinion spindle 61 are accordingly vibratable in a vertical plane at right angles to and above the rackbar R; and when the carriage is shifted upwardly, the pinion 60 engaged by the rack is lifted, with its teeth in constant mesh with the upstanding toothed web of the rack-bar R, which is shown L-shape in cross-section; and the carriage, with its rack-bar, and the spindle with its rack-bar engaging inion and are lifted together.

' On the downward shift of the paper carriage, said lifted members descend in unison, the pinion and rack-bar being in constant mesh during such downward shift. The leaf spring 62 is in action during all shifting movements of the carriage, and at all times when the type-bar actuating keys are depressed, and also during the return of theke s to initial'positions of rest.

en a. line has been printed and it is desired to return the carriage to starting position, the carriage may be manually pushed endwise to effect such return as usual; the pawl 69 on the star wheel 67 then riding freely over the teeth of the. ratchet I adjacent the star wheel and fixed onthe pinion spindle 59. d

When it is desired to return the carriage, mechanially and silently, the rack engaging pinion 60 is raised out of engagement with the rack-bar R by means of a horizontally slidable, release bar 85 (Fig. 3)

which is provided with inclined cam slots 86 in which rearwardly projecting studs 87 on the rack-bar work; one end of the release bar having an upturned finger end 88 at a side of the machine and accessible to the operator for manual pressure. The slots 86 are parallel and are formed slantingly in the release bar, the slots extending up wardly and slantingly in a direction away from the upturned finger end 88. When the release bar is moved inwardly from its position shown in Fig. 3, it is raised by the camaction of the inclined slot walls on the rack-bar studs 87 with the effect of lifting the release bar toa higher level and inso doing pushing its upper edge against the under sides of theyoke arms 60 thatsupport 'the star wheel and pinion carrying spindle; this upward-movement of the yoke arms being against the yielding resistance of the free/end of the leaf spring 62'that is always in gentle contact with the paper guide and which, being a fixed mem- -ber of the carriage, slides over the free end 65 of the spring. I v

I have pointed out above that at, the

moment of impression, the rigid escapement 35 dog is moved into the place just formerly occupied by the pivoted escapementdog under a given star wheel tooth, whereby the star wheel is held from rotation and thepaper carriage is'held stationary at the 4 moment of impression. In its movement ffrom under the t00th referred to, the pivoted escapement dog is moved," first laterally rearwards by. its rocking movement, and is next pressed upwardly by the wiper cam and the cam spring; and

space between said star wheel tooth and the next succeeding star wheel .tooth and contacts with the latter tooththe rotational descent of which presses the pivoted dog against the upper edge of the wiper cam 81 and depresses the latter against the tension of its spring'83.

79 has a for- The rigid escapement dog wardly projecting lug 89 inwardly of itsfree end; and this lug ,hasa vertical hole 90, shown square, through it, the hole loosely receivingthe upper end of an upstanding lever 91, the lower end of which member 1. Between its ends, this lever 91 has pivoted to it at 93, the rear end of a forwardly extending link 94, the front end of which is pivoted at 95 to the rear end of a dependent" rocker ;arn1- 96 fixed on a wlilper is next moved .latera y forwards -into the] pivoted at 92 to the rear transverse frame.

transverse rocker shaft 97, the ends of which are journalled in the side frames of the machine. This rocker shaft 97 is provided I near each journalled end with a fixed rocker arm 98, the front ends of 'the rocker arms 98 being connected by the transverse universal bar 99' of the machine.

All the type bar actuating key levers cross the universal bar and cov-operate as usual with the universal bar to force it downwardly, in which movement the escapement mechanism is actuated forswinging the.

fixed escapement dog into engagement with a star wheel tooth; the depression of the universal bar being against the tension of a coiled spring 100', one end of which is fixed at 101 to the dependent rocker arm 96 and the other end of which is fixed at 102 to the shaft 20. 'The tenSion of spring 100 keeps the transverse universal bar 99 for each of the key levers in .constant contact with the under edges of the key levers, so that there is no hammering effect between the universal bar and the key levers and the operation of the machine in this res ect is also silent; and in this connection it is swinging arm 105, the other endof which is 3 pivoted on a-stud 106 projecting-fniokm the Stout,

rear transverse frame member 1. coiled spring 107 is located on the stud with one end anchored at 108 in'the'swin'ging arm and its other anchored at 109 in the rear transverse frame member,'the spring exerting a constant upward re'ssure on the swin arm 105- to keep t e roll against the under side of the rack-bar R with suflicient pressure nearly to of the paper carriage.- 4 V In the contruction ,shown,,the centerof gravity of the carriage is rearwards of the axis of-ithe-supporting rod -12. Consequently the carriage leans rearwardly and is therefore provided on-its rear side with a trans-- balance the weight versefixed web 110, the ends of which are attached to the paper carriage end plates 9. The rear flange 111 of the web is parallel tothe printing line position ofthe platen and is made strai' litand bears slidably against. the front e go of a transverse bar 112,- the ends of which are, fixed at 113 to the upper edges of the frame corner arms 2. The bar 112 is dimensioned to he laterally springable between its fixed ends; and the opposite end portions of the bar have integral with them a rearwardly projecting, transversely extending truss 114 at P I the mid-section of which and directly opposed to the impression point at p, the bar is provided with a horizontal adjusting screw 115. threaded in a nut 116 at its front end and at its rear end in a nut 117 fixed to the truss. The front end of the nut 116 is shown pointed and'bearing against the springable bar, 112. This is an old construction for the purpose of adjusting the platenforwardly and closer to the extreme rearward limit of the type bar movement,

so as to obtain a heavier impression, if desired, at the printing point. A key actuated means for holding the front end arm 53 of the platen shift mechanism down is provided, the key of such locking means being indicated by 118. When the shift key member 53 is depressed, the platen carriage is in its lowermost position. A cushion 119 is located at each end of the path of each -rocking cam 46. The horizontal yoke structure 60*, 60 forms a vibratable pinionspindle carrier, and the vertical bracket 78 forms a vibratable escapement dog carrier.

What I claim is: 1. In a typewriting machine, the combination of a type bar having a plurality of printing characters spaced apart one from another; a type bar actuating mechanism;

an endwise movable platen and paper carriage provided with a lengthwise extending rack bar for cooperation with an escapement mechanism; an escapement mechanism comprising a vibratable pinion spindle carrier; a revoluble spindle mounted in the carrier;

on an end of the spindle, a pinion for engagement with the rack bar; on.such other end of .the spindle, a star wheel loosely mounted on the spindle; on the star wheel, a pawl; fixed on the other end of the spindle. a ratchet wheel for cooperation with the pawl; carried by the vibratable spindle pinion carrier, a vibratable escapement dog carrier provided with a fixed dog, a swingable dog, and a swingable wiper cam for the vibratable dog; and for the wiper cam a spring for returning it to normal position; and a spring for effecting travel of the paper carriage lengthwise in one direction; a key actuated, carriage-shift mechanism operatively connected withthe carriage and mechanism between the escapement mechanism and the nection with the swinging a cam; a link pivotally connected at one end to said lever and at its other end to a swinging wiper cam, a surface of which is in cooperative relation to said key; and a spring connected to said wiper cam and against the tension of which the wiper cam is moved when the said key is depressed; the carriage being provided with a rack bar for cooperation with an escapement mechanism; such escapement mechanism and operative connections between the escapement mechanism and the type bar actuating mechanism.

8. In a typewriting machine, the combination of an endwise reciprocable type bar and a key actuated type bar reciprocating mechanismcomprising a member in detachable connection with the type bar; and demountable means for holding the type bar in working position whereby the type bar may be readily removed for replacement by another type bar.

4. In a typewriting machine, the combination of an endwise reciprocable type bar; a type bar actuating key and a mechanism for operatively connecting the type bar and said key, such mechanism comprising a pivoted wiper cam having a cam wall for cooperation with the type bar and also having a cam wall for contact with the straightened extension of a spiral spring, when said key lever is depressed; and such spiral spring; the spring having a straightened extension in the path of the wiper cam and having one end secured to-the wiper cam and its other end fixedly secured.

5. The combination, in a typewriting ma-' chine, of a paper carnage and paper car-,

riage actuating mechanism with a type head actuating mechanism comprising a depres-- sible and automatically returnable key lever; a rockable wiper cam having op osed cam surfaces; and a coiled spring straightened end portion attached to the wiper cam and positioned to be progressively engaged by one of the cam surfaces of the wiper cam, the other end of the coiled spring being anchored to the machine; and

the key lever having a member maintained by the tension of said spring in constant contact with the other cam edge of the wiper cam.

6. The combination, in a typewriting'machine, of apaper. carriage and paper carriage actuatin mechanism with a type head actuating medhanism comprising a depressible and automatically returnable key lever; a roekable wiper cam having opposed cam surfaces; and a coiled spring having a straightened end portion attached to the wiper cam and positioned to be pro essively engaged by one of the camsu aces of the wiper cam, the other end of the coiled spring being anchored to the machine; and

the keyllever having a member maintained aving a under side of the key lever.

by the tension of said spring in constant contact with the other cam edge of the wiper can and a rockable universal bar mechanism; and a spring for keepin the universal bar in constant contact wit the 7. In a typewriting machine, the combination' with a vertically shiftable endwise movable paper carriage and a type head having a plurality of spaced apart printing characters one above another of a type head actuating mechanism comprising an impression key lever and toggle link members between the key lever and type head, and also comprising a swingable wiper cam and a wiper cam. and key lever return spring, the wiper cam supporting the key lever in position of rest under tension of the spring, and the wiper cam having a surface which, when the key lever is depressed,

progressively engages the spring and puts' it under increasing tension until the depressing pressure on the key lever is removed.

8. In a typewriting machine, the combination of a toggle lever actuated type head having a plurality of printing characters; an impression key operatively connected with said toggle lever type head actuating mechanism; an endwise movable and vertically shiftable paper carriage slidably mounted on a transversely extending, upwardly and downwardly shiftable carriage guide and lifting rod; said rod, the carriage being provided with a slotted fixed tube within and by which the rod is embraced; a pair of rocker arms, each pivotally mounted on a stationary member of the machine, and each rocker arm having a cam wall engaging projection and also having an upwardly extending ortion fixed in said rod and-extending through the tube slot; a transverse rocker shaft journaled in stationary members of.'the machine and having fixed to it' a pair of lengthwise slotted carriage shifting cams for reception of a rocker arm projection; a shift key pivoted to one of said shifting cams; and a shift key return spring, all combined and operating to effect printing andcarriage shift movements with a inlnimum of noise; the machine being constructed to carry a cushion at each end of the path of each shifting camt 9. In a. typewriting machine, the combination with a series of key actuated type heads,

each having a plurality of printing characmechanism comprising; a member having a constant pivotal eonnection with the rocker cam structure.

10. In a typewriting machine, the combination with a vertically shiftable, endwise movable paper carriage and a type head having a plurality of printing characters spaced one above another thereon, of a type head actuatingmechanism comprising an impression key lever, toggle link members between the key lever and head, and a wiper cam and spring tending to return said parts to aposition of rest, said cam being arranged when said lever is depressed, to progessively engage and tension said spring.

11. In a typewriting machine, the combination with an endwise movable paper carriage provided with a rack bar, of an escapement mechanism comprising a spindle provided with a pinion for mesh ng engagement with said rack bar, a device supporting said spindle for tilting movement to carry said pinion into and out of engagement with said rack bar to release the latter, and means for effecting said tilting movement of said spindle.

Signed at New Yprk, in the county of New York and State of New York, this 20th I day of August A. D. 1920.

WELLINGTON PARKER KIDDER. 

